package com.sqnu.dashe.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sqnu.dashe.common.BaseContext;
import com.sqnu.dashe.common.CustomException;
import com.sqnu.dashe.entity.*;
import com.sqnu.dashe.mapper.OrderMapper;
import com.sqnu.dashe.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * @author mmy
 * @create 2023-06-15 15:48
 * @description
 */
@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private OrderDetailService orderDetailService;

    @Override
    //需要操作多次数据库，添加事务控制
    @Transactional
    public void submit(Orders orders) {
        //获取当前用户
        Long currentId = BaseContext.getCurrentId();

        //获取当前用户的购物车信息
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        if (list == null || list.size() == 0) {
            throw new CustomException("购物车为空，不能下单");
        }

        //查询用户数据
        User user = userService.getById(currentId);

        //查询地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);

        if (addressBook == null ) {
            throw new CustomException("用户信息有误，不能下单");
        }


        //向订单表插入一条数据
        //由于前端发送的数据不足，需要手动设置
        //idworker 是一个基于zookeeper和snowflake算法的分布式统一ID生成工具，
        // 通过zookeeper自动注册机器（最多1024台），无需手动指定workerId和dataCenterId。
        long orderId = IdWorker.getId();
        //原子操作，保证线程安全
        AtomicInteger amount = new AtomicInteger(0);

        //遍历购物车数据
        List<OrderDetail> collect = list.stream().map(item -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(currentId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        this.save(orders);

        //向订单明细表插入多条数据
        orderDetailService.saveBatch(collect);
        //清空购物车数据
        shoppingCartService.remove(queryWrapper);
    }

}
